How to reset position on all keyframes?
In pose mode, select the bones you wish to reset.  Use a &quot;hide selected&quot; operation (shift h for me) to hide all other bones.

Open a graph editor view.  Make sure &quot;only show selected&quot; is enabled, in the upper right corner of the graph editor.  Click on the &quot;filters&quot; button and enter &quot;location&quot; (no quotes) in the &quot;f-curve name filter&quot; field, which has a magnifying glass icon in it.

Now you only have location keyframes of your selected bones.  In graph editor, select all and delete.

In 3D window, use a &quot;clear pose location&quot; operation (alt g for me.)

Optionally, keyframe at the beginning and end of your animation.